package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Description: 过滤器功能实现
 * @ClassName: LoginCheckFilter
 * @Author: xmc
 * @Date: 2022/8/15 7:42
 * @Version: 1.0
 */
@WebFilter(filterName = "LoginFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();
//        2、判断本次请求是否需要处理
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",
                "/user/sendMsg"
        };
//        3、如果不需要处理，则直接放行
        if(check(urls,requestURI)){
            filterChain.doFilter(request,response);
            return;
        }
//        4-1、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            BaseContext.setCurrentThreadLocal((Long) request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
            return;
        }
//        4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            BaseContext.setCurrentThreadLocal((Long) request.getSession().getAttribute("user"));
            filterChain.doFilter(request,response);
            return;
        }
//        5、如果未登录则返回未登录结果

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    
    /**
     * 路径匹配比较
     *方法说明:
     * @author xmc
     * @param urls
     * @param requestURI 
     * @return boolean
     * @date 2022/8/15 8:17
     */
    
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}
